Perhaps a browse through the MAME source code would be useful?
Quoting Phil Morris <[email protected]>:
> Some time ago I could swear that someone created a program to view and
> generally make sense of the contents of the Asteroids Vector ROM, ie it was
> possible to look at how the saucers, asteroids, character set, etc were
> defined for use by the main program code.
>
> Despite a good look around though I can't see any signs of such a program
> (maybe I'm using the wrong search string).
>
> Anyhow, does this ring any bells with anyone?
>
> Failing that, does anyone know how to make sense of the vector ROM? I ask
> because I'm currently messing around with writing an Asteroids program
> (purely for fun and as a programming learning exercise) and would like to
> get the thing to look as accurate as possible.
>
>
> Thanks,
> Phil
>
>
>
>
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